CN103900664A - Anaesthesia machine flow sensor calibration method and device - Google Patents
Anaesthesia machine flow sensor calibration method and device Download PDFInfo
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- CN103900664A CN103900664A CN201210575467.XA CN201210575467A CN103900664A CN 103900664 A CN103900664 A CN 103900664A CN 201210575467 A CN201210575467 A CN 201210575467A CN 103900664 A CN103900664 A CN 103900664A
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Abstract
The invention discloses an anaesthesia machine flow sensor calibration method and device. The method includes the steps of connecting a monitoring device with a flow sensor in series, closing an exhalation valve, changing the opening degree of the exhalation valve according to the gradually-increasing/gradually-decreasing rule, conducting filtering on the values of monitored flow and the values of the voltage outputted by the flow sensor, reading and recording the monitored value and the value of the voltage outputted by the flow meter for each opening degree of the exhalation valve, generating voltage-flow data tables and the like, and obtaining a set of voltage-flow data tables by presetting a set of organized flow values through the table look-up or interpolation method, wherein the voltage-flow data tables include the flow meters conforming to the equal difference rule or other rules. In the method and device, filtering is adopted, accuracy of calibration is improved, calibration data are simplified into one-dimensional voltage data to be stored, and actual use of the data is facilitated; in addition, the calibration process is automatically completed through a preset program, and the work efficiency is high.
Description
Technical field
The present invention relates to Anesthesia machine field, relate in particular to a kind of Calibration Method of the flow transducer of anesthesia apparatus that adopts one-line interpolation algorithm and realize the device of the method.
Background technology
Anesthesia machine is the alveolar of by mechanical circuit, arcotic/agent being sent into patient, forms the equipment of anesthetic gases dividing potential drop, after anesthetic disperse blood, inhibiting effect is directly occurred central nervous system to, thereby produces the effect of anesthesia.Flow sensor is to detect flow signal and to change into the equipment of electric signal, for detection of flow signal for Anesthesia machine decision-making ventilation control program.
Being installed on the accuracy that flow sensor accuracy on Anesthesia machine is directly connected to the detected values such as breathing gas flow velocity, tidal volume and throughput, is to affect one of key factor in Anesthesia machine safe ventilation process.In clinical use procedure, there is individual difference for the flow sensor of Anesthesia machine, be prone to that self is aging, time float, the problem such as temperature is floated, ponding, need carry out calibration to sensor, with the accuracy and the security that ensure that sensor ventilation is controlled in good time.Common calibration process is that the sensor output voltage value by measuring and record under multiple different regime flows realizes, thereby sets up and store the corresponding relation between input flow rate and sensor output voltage, is convenient to use in the future.
Conventionally for Anesthesia machine is easy to use, conventionally flow value is set as to one group of data with equal difference or other rules, person easy to use is according to the size of sick human needs adjust flux, the preset flow value value that normally the flow regulation rotary knob on Anesthesia machine identifies.Therefore only need to detect the magnitude of voltage that flow value is corresponding, the voltage detecting value of flow sensor is stored in EEPROM or other nonvolatile memorys and can completes calibration.
Common calibration mode has following two kinds:
(1) manually calibration: by the aperture of incremented/decremented rule manual adjustments inlet valve, in the time that the flow value showing on flow monitoring equipment reaches preset flow, record the now output voltage of flow sensor, default multiple flow values, repeat above-mentioned measuring process, because preset flow has equal difference incremented/decremented or other rules, therefore obtain having equal difference incremented/decremented or other rules voltage-data on flows table.In measuring process, owing to adopting manual adjustments mode, when each inlet valve aperture changes, in measurement, can wait for the regular hour, reading flow value and magnitude of voltage again after inlet valve stability of flow, its detected value is comparatively accurate.But the problems such as it is loaded down with trivial details that manual operation has process, inefficiency.
(2) calibration automatically: automatically regulate the aperture of inlet valve by incremented/decremented rule, when each inlet valve aperture changes, recorded stream value and magnitude of voltage, obtain voltage-data on flows table automatically.Owing to adopting the mode that automatically regulates the aperture of inlet valve, therefore be difficult to preset one group of flow value that has equal difference or other rules, although it is corresponding one by one with magnitude of voltage that the data that calibration obtains are flow values, but in this two-dimensional array, an arbitrary array is all difficult to form the ordered series of numbers with equal difference incremented/decremented or other rules, its reason is, even if inlet valve is by the aperture of equal difference rule, but inlet valve gas flow value not necessarily changes by equal difference rule.In addition, automatically, in calibration process, due to factors such as flow rate disturbances, in measuring process, there is certain contingency, easily produce accidental error, the accuracy that impact is measured.
In sum, in prior art, to have operating process loaded down with trivial details for manual adjustments mode, the defects such as inefficiency, and have cannot predetermined current value for regulative mode automatically, is difficult to obtain the defects such as one group of voltage-data on flows table with some specific rule after calibration completes.
Summary of the invention
In order to overcome loaded down with trivial details, the inefficiency of existing operating process in said method and device, accuracy rate is low, error is large and be difficult to obtain the defects such as one group of voltage-data on flows table with equal difference or other regular stream values, technical matters to be solved by this invention is to propose a kind of flow transducer of anesthesia apparatus Calibration Method and device, its accuracy with calibration is high, practical, automaticity high.
For reaching this object, the present invention by the following technical solutions:
A kind of flow transducer of anesthesia apparatus Calibration Method, its feature is implemented as follows:
S00: calibration starts, makes outside monitoring equipment be connected with Anesthesia machine, and described monitoring equipment is located on the respiration channel at flow sensor (6) place;
S10: the outlet valve on described lung ventilator is in closed condition, and the control module control inlet valve in the calibration control module (5) in described lung ventilator changes its aperture according to the rule of incremented/decremented;
S20: the flow value f that under each described inlet valve aperture, described monitoring equipment detects is read and recorded to the signal acquisition module in described calibration control module (5)
nwith described flow sensor (6) output voltage values v
n, the flow value f under all apertures of described inlet valve
nwith magnitude of voltage v
nafter collection, the computing module formation voltage-data on flows table in described calibration control module (5);
S30: described computing module is by tabling look-up and interpolation method calculating generation regularization voltage-data on flows table, and in table, flow value F is the preset value of one group of regularization;
S40: the magnitude of voltage V that the described flow sensor (6) corresponding to flow value F of storage regularization exported is to the nonvolatile memory of described calibration control module (5), and calibration finishes.
In order to solve flow value regularization problem, preferred, in step S30, when described computing module generates described regularization voltage-data on flows table, one group of regular preset flow value is first set;
When monitoring stream value and preset flow value F are when unequal, inquire about in described voltage-data on flows table and be worth two adjacent monitoring stream value f with preset flow
nand f
n+1and two described flow sensor (6) output voltage values v that monitoring stream value is corresponding
nand v
n+1, obtain by linear interpolation method described flow sensor (6) the output voltage values V that preset flow value F is corresponding;
In the time that monitoring stream value equates F with preset flow value, monitoring stream value f
ncorresponding described flow sensor (6) output voltage values v
nbe described flow sensor (6) the output voltage values V that preset flow value F is corresponding.
Described linear interpolation method is one-line interpolation method, and its formula is:
Magnitude of voltage V=(F-f
n)/(f
n+1-F
n) * (v
n+1-v
n)+v
n, f
n≤ F≤f
n+1.
The measuring error problem causing in order to solve the factors such as flow rate disturbance, in S20 step, is reading and recorded stream value f
nwith magnitude of voltage v
nbefore, first to flow value f
nwith magnitude of voltage v
ncarry out filtering processing.
The problems such as manual operation process is loaded down with trivial details in order to solve, inefficiency, signals collecting, data operation and send steering order and automatically completed by calibration control module in above-mentioned calibration process.
In order to realize said method, adopt and carry out as lower device:
Realize a calibration device for Calibration Method in claim 1, comprise Anesthesia machine and the monitoring equipment in described Anesthesia machine outside, described calibration control module is located at described Anesthesia machine control mainboard inside, and described checkout equipment is gas meter.
Further, described calibration control module comprises:
Control module, changes its aperture for controlling inlet valve according to the rule of incremented/decremented;
Signal acquisition module, for reading and record the flow value f that under each described inlet valve aperture, described monitoring equipment detects
nwith described flow sensor output voltage values v
n;
Computing module, for formation voltage-data on flows table and regularization voltage-data on flows table.
Preferably, described signal acquisition module inside is provided with flow signal filtering circuit, and flow signal filtering circuit is connected with the calibration PORT COM on Anesthesia machine.
Preferably, described signal acquisition module inside is provided with voltage signal filtering circuit, and voltage signal filtering circuit is connected with flow sensor.
Preferably, described calibration PORT COM is connected by data line with the PORT COM on described monitoring equipment.
Beneficial effect of the present invention is: in calibration process, flowmeter flow sensor output voltage values has been added to filtering processing, overcome the measuring error problem that the factors such as flow rate disturbance cause, improve the accuracy of calibration, employing is tabled look-up and the mode of interpolation is carried out data processing in conjunction with the preset flow value of regularization to voltage-data on flows table, Calibration Data is simplified to one dimension voltage value data to be stored in EEPROM or other nonvolatile memorys, be convenient to the actual use of data, calibration process is carried out automatically by pre-set programs, and work efficiency is high.
Brief description of the drawings
Fig. 1 is the structural representation of the calibration device that provides of the specific embodiment of the invention;
Fig. 2 is the process flow diagram of the flow transducer of anesthesia apparatus Calibration Method that provides of the specific embodiment of the invention;
Fig. 3 is the control program process flow diagram of the flow transducer of anesthesia apparatus Calibration Method that provides of the specific embodiment of the invention;
Fig. 4 is the Calibration Data application flows figure of the flow transducer of anesthesia apparatus Calibration Method that provides of the specific embodiment of the invention.
In figure:
1, Anesthesia machine; 2, monitoring equipment; 3, flow signal filtering circuit; 4, voltage signal filtering circuit; 5, calibration control module; 6, flow sensor.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
Fig. 1 is the structural representation of the flow transducer of anesthesia apparatus calibration device that provides of the specific embodiment of the invention.
A calibration device for flow transducer of anesthesia apparatus, comprises Anesthesia machine 1 and monitoring equipment 2, and Anesthesia machine 1 is controlled mainboard inside and is provided with calibration control module 5, and monitoring equipment 2 is flowmeter.
Preferably, the signal acquisition module inside of calibration control module 5 is provided with flow signal filtering circuit 3, and flow signal filtering circuit 3 is connected with the calibration PORT COM on Anesthesia machine 1, and calibration PORT COM is connected by data line with monitoring equipment 2 PORT COM.The signal acquisition module inside of calibration control module 5 is provided with voltage signal filtering circuit 4, and voltage signal filtering circuit 4 is connected with flow sensor 6.Flow signal filtering circuit 3 and voltage signal filtering circuit 4 have carried out filtering processing to the flow signal in calibration process and voltage signal, thereby overcome the measuring error problem that the factors such as flow rate disturbance cause, have improved the accuracy of calibration.
Preferably, adopt software filtering mode to carry out filtering processing to the flow signal in calibration process and voltage signal.
Fig. 2 is the process flow diagram of the flow transducer of anesthesia apparatus Calibration Method that provides of the specific embodiment of the invention.
A kind of flow transducer of anesthesia apparatus Calibration Method, its step is implemented:
First monitoring equipment 2 is connected with flow sensor 6, be that monitoring equipment 2 is located on same gas passage with flow sensor 6, equal to ensure by the detection flow of monitoring equipment 2 and flow sensor 6, Anesthesia machine 1 external communication port is connected by data line with monitoring equipment 2 PORT COM, makes in the flow detecting signal input calibration control module 5 of monitoring equipment.
Then close outlet valve, every 1-2s, change inlet valve aperture according to the rule of incremented/decremented, read and record the monitoring stream value f of each inlet valve aperture
nwith flow sensor 6 output voltage values v
n, adopt certain time interval, be conducive to after inlet valve stability of flow reading flow value f again
nwith magnitude of voltage v
nthereby, make to detect flow value more accurate.Read and recorded stream value and magnitude of voltage before, to flow value f
nwith magnitude of voltage v
ncarry out filtering processing.The size of valve body fluctuations in discharge during for the each aperture of inlet valve, should make as far as possible valve body fluctuations in discharge be less than the difference of corresponding two adjacent preset flow values, in the process that is conducive to adopt linear interpolation method to obtain flow sensor corresponding to preset flow value 6 output voltage values, improve the accuracy that is worth two adjacent monitoring stream values with this preset flow, the data volume gathering suitably increases, and is conducive to improve the degree of approximation of interpolation curve obtained and true curve.Conventionally carry out in the following way choosing of preset flow value, for example elected constant flow scope is 0～80L/min, is in the of 0, at preset value F from flow value
n≤ 2L/min, taking 0.1L/min as step pitch choosing value, at preset value F
nwhen > 2L/min, taking 0.1L/min as step pitch choosing value, obtain one group of preset value array with compound arithmetic progression rule, as preset flow value.It should be noted that, the above-mentioned unexpected increase of choosing step pitch in process, it is due at the beginning of opening valve body valve that step pitch increases reason, the variation of flow is little, but the increase of valve body aperture is thereupon little even if valve body aperture changes, and also can cause larger fluctuations in discharge, therefore need to increase step pitch, more press close to the actual conditions of the fluctuations in discharge of valve body.
After treating that the dirty value of all inlet valve apertures and magnitude of voltage gather, according to the data on flows and the voltage data that gather, formation voltage-data on flows table, in step S30, when described computing module generates described regularization voltage-data on flows table, one group of regular preset flow value is first set; When monitoring stream value and preset flow value F are when unequal, inquire about in described voltage-data on flows table and be worth two adjacent monitoring stream value f with preset flow
nand f
n+1and two described flow sensor 6 output voltage values v that monitoring stream value is corresponding
nand v
n+1, obtain by linear interpolation method the described flow sensor 6 output voltage values V that preset flow value F is corresponding; In the time that monitoring stream value equates F with preset flow value, monitoring stream value f
ncorresponding described flow sensor 6 output voltage values v
nbe the described flow sensor 6 output voltage values V that preset flow value F is corresponding.Increase progressively as example taking inlet valve aperture, described linear interpolation method is one-line interpolation method, and its formula is:
Magnitude of voltage V=(F-f
n)/(f
n+1-F
n) * (v
n+1-v
n)+v
n, f
n≤ F≤f
n+1
Wherein: F-preset flow value is preset value.
F
n-be worth smaller value in two adjacent monitoring stream values with preset flow, be detected value.
F
n+1-be worth higher value in two adjacent monitoring stream values with preset flow, be detected value.
The magnitude of voltage that flow sensor 6 corresponding to V-preset flow value exported.
V
n-be worth with preset flow the magnitude of voltage that the flow sensor 6 corresponding compared with rill value in two adjacent monitoring stream values exported, be detected value.
V
n+1-be worth with preset flow the magnitude of voltage that flow sensor 6 that larger flow value in two adjacent monitoring stream values is corresponding is exported, be detected value.
Because detected value and preset value are known quantity, therefore can obtain the magnitude of voltage that flow sensor corresponding to preset flow value 6 exported, repeat said process, obtain the magnitude of voltage that flow sensor 6 corresponding to all preset flow values exported, obtain one group of voltage-data on flows table with equal difference or other regular stream values, calibration magnitude of voltage is simplified to a voltage data storage.In addition, except adopting aforesaid way regularization flow value, also can adopt the first matching mode of interpolation again, more be conducive to reduce accidental error.
The value normally identifying according to the flow regulation rotary knob on Anesthesia machine due to preset flow value, therefore only need to detect the magnitude of voltage that flow value is corresponding, the voltage detecting value of flow sensor 6 is stored in EEPROM or other nonvolatile memorys and can completes calibration.
In addition, above-mentioned calibration process completes automatically by calibration control module 5.
Fig. 3 is the control program process flow diagram of the flow transducer of anesthesia apparatus Calibration Method that provides of the specific embodiment of the invention.
Checkout equipment has connected and has cut out after outlet valve, start calibration button, calibration control module 5 moves calibration program, first send steering order to inlet valve, valve is opened slightly, start air-breathingly with a flow initial value, signal acquisition module reads and records the flow value and the flow sensor output voltage values that under this aperture, on checkout equipment, show; Then calibration control module 5 judges according to inlet valve aperture situation, if inlet valve is not opened completely, increase after inlet valve opening value, signal acquisition module reads and records the flow value and the flow sensor output voltage values that under this aperture, on checkout equipment, show, repeat aforesaid operations, until inlet valve opens completely, when maximum opening, end signal gatherer process.Then voltage-data on flows the table generating in signal acquisition process is carried out to data processing, by the interpolation method of tabling look-up, obtain default magnitude of voltage corresponding to regularization flow value, i.e. default V corresponding to F.Finally, the magnitude of voltage V that flow sensor corresponding the flow value F of regularization 6 is exported is stored in nonvolatile memory, and calibration finishes.
Fig. 4 is the Calibration Data application flows figure of the flow transducer of anesthesia apparatus Calibration Method that provides of the specific embodiment of the invention.
Obtain after one group of voltage-data on flows table about preset flow value, when Calibration Data application, the magnitude of voltage of exporting for arbitrary flow sensor 6, all can utilize the method for interpolation to obtain the flow value of this magnitude of voltage to use, for practical application.
For example, ask according to the voltage-data on flows table about preset flow value the flow sensor flow value of flowing through that arbitrary flow sensor 6 output voltage values are corresponding, formula is as follows:
Flow value Y=(X-V
n)/(F
n+1-V
n) * (F
n+1-F
n)+F
n, V
n≤ X≤V
n+1
Wherein: Y-required flow value.
F
nsmall voltage value in-voltage-data on flows table about preset flow value in two magnitudes of voltage adjacent with given magnitude of voltage, can table look-up.
F
n+1larger magnitude of voltage in-voltage-data on flows table about preset flow value in two magnitudes of voltage adjacent with given magnitude of voltage, can table look-up.
X-given magnitude of voltage.
V
nflow value corresponding to small voltage value in-voltage-data on flows table about preset flow value in two magnitudes of voltage adjacent with given magnitude of voltage, can table look-up.
V
n+1flow value corresponding to larger magnitude of voltage in-voltage-data on flows table about preset flow value in two magnitudes of voltage adjacent with given magnitude of voltage, can table look-up.
Due to the data on equation the right or maybe can table look-up for data-oriented, employing the method can be obtained flow value corresponding to given magnitude of voltage that arbitrary flow sensor 6 is exported, for practical application.
The present invention is described by embodiment, and those skilled in the art know, without departing from the spirit and scope of the present invention, can carry out various changes or equivalence replacement to these features and embodiment.In addition, under guidance of the present invention, can modify to adapt to concrete situation and material and not depart from the spirit and scope of the present invention these features and embodiment.Therefore, the present invention is not subject to the restriction of specific embodiment disclosed herein, and the embodiment in all the application's of falling into claim belongs to the scope of protection of the invention.
Claims (10)
1. a flow transducer of anesthesia apparatus Calibration Method, its feature is implemented as follows:
S00: calibration starts, makes outside monitoring equipment be connected with Anesthesia machine, and described monitoring equipment is located on the respiration channel at flow sensor (6) place;
S10: the outlet valve on described lung ventilator is in closed condition, and the control module control inlet valve in the calibration control module (5) in described lung ventilator changes its aperture according to the rule of incremented/decremented;
S20: the flow value f that under each described inlet valve aperture, described monitoring equipment detects is read and recorded to the signal acquisition module in described calibration control module (5)
nwith described flow sensor (6) output voltage values v
n, the flow value f under all apertures of described inlet valve
nwith magnitude of voltage v
nafter collection, the computing module formation voltage-data on flows table in described calibration control module (5);
S30: described computing module is by tabling look-up and interpolation method calculating generation regularization voltage-data on flows table, and in table, flow value F is the preset value of one group of regularization;
S40: the magnitude of voltage V that the described flow sensor (6) corresponding to flow value F of storage regularization exported is to the nonvolatile memory of described calibration control module (5), and calibration finishes.
2. flow sensor Calibration Method according to claim 1, is characterized in that, in S20 step, is reading and recorded stream value f
nwith magnitude of voltage v
nbefore, first to flow value f
nwith magnitude of voltage v
ncarry out filtering processing.
3. flow sensor Calibration Method according to claim 1, is characterized in that, in step S30, when described computing module generates described regularization voltage-data on flows table, one group of regular preset flow value is first set;
When monitoring stream value and preset flow value F are when unequal, inquire about in described voltage-data on flows table and be worth two adjacent monitoring stream value f with preset flow
nand f
n+1and two described flow sensor (6) output voltage values v that monitoring stream value is corresponding
nand v
n+1, obtain by linear interpolation method described flow sensor (6) the output voltage values V that preset flow value F is corresponding;
In the time that monitoring stream value equates F with preset flow value, monitoring stream value f
ncorresponding described flow sensor (6) output voltage values v
nbe described flow sensor (6) the output voltage values V that preset flow value F is corresponding.
4. flow sensor Calibration Method according to claim 3, is characterized in that, described linear interpolation method is one-line interpolation method, and its formula is:
Magnitude of voltage V=(F-f
n)/(f
n+1-F
n) * (v
n+1-v
n)+v
n, f
n≤ F≤f
n+1.
5. according to the flow sensor Calibration Method described in claim 1 to 4, it is characterized in that signals collecting, data operation and send steering order and automatically completed by described calibration control module (5) in above-mentioned calibration process.
6. realize the calibration device of Calibration Method in claim 1 for one kind, comprise Anesthesia machine (1) and the monitoring equipment (2) in described Anesthesia machine (1) outside, it is characterized in that, described calibration control module (5) is located at described Anesthesia machine (1) and is controlled mainboard inside, and described checkout equipment is gas meter.
7. a kind of calibration device according to claim 6, is characterized in that, described calibration control module (5) comprising:
Control module, changes its aperture for controlling inlet valve according to the rule of incremented/decremented;
Signal acquisition module, for reading and record the flow value f that under each described inlet valve aperture, described monitoring equipment detects
nwith described flow sensor (6) output voltage values v
n;
Computing module, for formation voltage-data on flows table and regularization voltage-data on flows table.
8. according to a kind of calibration device described in claim 6 or 7, it is characterized in that, described signal acquisition module inside is provided with flow signal filtering circuit (3), and flow signal filtering circuit (3) is connected with the calibration PORT COM on Anesthesia machine (1).
9. according to a kind of calibration device described in claim 6 or 7, it is characterized in that, described signal acquisition module inside is provided with voltage signal filtering circuit (4), and voltage signal filtering circuit (4) is connected with flow sensor (6).
10. a kind of calibration device according to claim 8, is characterized in that, described calibration PORT COM is connected by data line with the PORT COM on described monitoring equipment (2).
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